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| description | Research in magnon and spin-phonon transport, alongside scientific software and research tools developed by Won-Young Choi. |
Explore my work across fundamental spin-transport research and scientific software development.
Spin–orbit coupling links an electron's spin to its motion through electric fields in solids. My research uses SOC-driven transport to generate, manipulate, and detect spin currents in magnetic heterostructures, connecting microscopic spin-dependent scattering to measurable electrical signals and magnetization dynamics.
- Spin-current generation and spin–charge conversion
- Spin Hall magnetoresistance and nonlinear transport
- Spin–orbit torques and current-driven magnetization switching
Magnons—collective excitations of ordered spins—can carry angular momentum through electrically insulating antiferromagnets. My research examines how the Néel-vector orientation and magnon coherence govern spin transmission across antiferromagnet/ferromagnet heterostructures.
- Spin-polarization filtering by antiferromagnetic order
- Magnon-mediated spin–orbit torque and magnetization switching
- Low-dissipation transport for energy-efficient spintronic devices
Spin–phonon coupling links electronic spin dynamics to lattice vibrations, enabling angular momentum and energy to move between spin and phonon channels. I study how this conversion influences nonequilibrium spin flow, damping, and thermal transport in magnetic heterostructures.
- Angular-momentum exchange between spins and the lattice
- Separation of electronic, magnonic, and phononic signals
- Thermal pathways for controlling spin transport and device response
A desktop tool for extracting x-, y-, and z-spin damping-like and field-like torque efficiencies from angular first- and second-harmonic Hall measurements. It supports both in-plane and perpendicular magnetic anisotropy samples.
The application and source code are available upon request.
A desktop application for turning measurement data into clean, publication-ready scientific figures with a live, interactive canvas.
- 2D, polar, 3D, heatmap, surface, bar, and multi-panel figures
- Drag-to-edit layouts, legends, annotations, axes, and colorbars
- Journal size presets, LaTeX labels, error bars, broken axes, and high-resolution export
- English and Korean interface with searchable settings
System requirement: Apple Silicon Mac (M1 or later). The current build is not notarized; follow the first-launch instructions in the manual to allow it in System Settings → Privacy & Security.
In-plane magnetization trajectory
Macrospin precession dynamics
A desktop simulator for exploring magnetization dynamics within the macrospin approximation. It numerically solves the Landau–Lifshitz–Gilbert equation and visualizes precession, spin–orbit-torque switching, and time-resolved trajectories.
Currently under active development — the AFM (antiferromagnet) mode is incomplete; the FM feature set is validated and stable.
A native menu-bar utility that turns the MacBook notch into a quick launcher: push the cursor into the notch (or press ⌥Space) and a floating panel of your folders and apps appears — launch, browse, and file things away without leaving the current app.
- Trigger by shoving the cursor into the notch, the top-center of external displays, or a global hotkey
- In-panel folder browsing with search, sorting, and Quick Look preview
- Drag & drop both ways — drop a file onto a folder tile to copy it there in one motion
- Multiple workspaces for different sets of folders, Korean and English interface
System requirement: Apple Silicon Mac, macOS 14 or later. The build is not notarized, so macOS blocks the first launch: open System Settings → Privacy & Security, scroll down, and click Open Anyway. Built with SwiftUI/AppKit, assisted by Claude Code.